EMPLOYEE BENEFIT PLANS - Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 268.9	$ 262.2	$ 234.6
International | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	268.5	261.8	234.2
International | Pension Plans | Insurance contracts and other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	143.2	143.7	$ 130.2
International | Pension Plans | Recurring
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	268.9	262.2
International | Pension Plans | Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	125.7	118.5
International | Pension Plans | Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	143.2	143.7
International | Pension Plans | Recurring | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	66.8	63.0
International | Pension Plans | Recurring | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	66.8	63.0
International | Pension Plans | Recurring | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Corporate securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	57.9	54.6
International | Pension Plans | Recurring | Corporate securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	57.9	54.6
International | Pension Plans | Recurring | Corporate securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Corporate securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1.0	0.9
International | Pension Plans | Recurring | Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1.0	0.9
International | Pension Plans | Recurring | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Insurance contracts and other
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	143.2	143.7
International | Pension Plans | Recurring | Insurance contracts and other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Insurance contracts and other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
International | Pension Plans | Recurring | Insurance contracts and other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 143.2	$ 143.7